backdrop background black blowball Dandelion dark green inversion inverted seed seeds texture abstract gloomy grunge grungy natural design nature winter color colour lavender lilac magenta pattern purple swirls violet altocumulus blue cloud clouds fleecy joy Nyberg sky summer white erode erosion rock rocks saavem stratification stratified stratum animal fur skin stripes zebra architecture brick bricks building city classic red street wall brown ceramic close-up grain lines sand yellow